package com.sky.service.impl;

import com.fasterxml.jackson.databind.util.BeanUtil;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.result.Result;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {


    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 新增菜品同时保存口味数据
     * @param dishDTO
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);


        //向菜品表插入数据
        dishMapper.insert(dish);
        //获取insert语句的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors !=null && flavors.size() > 0){
            flavors.forEach(f -> {
                f.setDishId(dishId);
            });
            //向口味表插入数据
            dishFlavorMapper.insertBatch(flavors);
        }


    }


    /**
     * 菜品分页
     * @param dishPageQueryDTO
     * @return
     */
    //事务注解，保证执行出错的时候会回滚
    @Transactional
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        //user pageHelper
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page=dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }


    //事务注解，保证执行出错的时候会回滚
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //判断菜品是否在售
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus()== StatusConstant.ENABLE)
            {
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //是否关联套餐
        List<Long> setmealIdsbyDishIds = setmealDishMapper.getSetmealIdsbyDishIds(ids);
        if(setmealIdsbyDishIds !=null && setmealIdsbyDishIds.size() > 0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品表中的菜品数据
        //缺点：当遍历的sql语句过多时，会引发一些性能问题
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            //删除口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }

        //优化  使用sql语句批量删除
        dishMapper.deleteBatch(ids);
        dishFlavorMapper.deleteBatch(ids);
    }


    /**
     *  根据id查询菜品信息和口味信息
     */

    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜数据
        Dish dish = dishMapper.getById(id);
        //根据id查询口味数据
        List<DishFlavor> dishFlavors=dishFlavorMapper.getByDishId(id);

        //将数据封装到VO中
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }


    /**
     * 修改菜品和口味shuju
     */
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //更新菜品数据
        dishMapper.update(dish);
        //删除原有的口味数据
        dishFlavorMapper.getByDishId(dishDTO.getId());
        //在重新插入口味数据
        List<DishFlavor> flavors=dishDTO.getFlavors();
        if(flavors !=null && flavors.size() > 0){
            flavors.forEach(f -> {
                f.setDishId(dishDTO.getId());
            });
            //向口味表插入数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }


    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }


    @Transactional
    public void startOrStpop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);
        if(status==StatusConstant.ENABLE){
            //如果时停售操作，还需将包含的菜品套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsbyDishIds(dishIds);
            if(setmealIds !=null && setmealIds.size()>0){
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }
}
